Runable与Callable

package com.enterec.orders.web;

import lombok.SneakyThrows;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.*;

/**
 * @Description TODO
 * @ClassName MyThread
 * @Author LuoLT
 * @Date 2020-10-12
 **/
public class MyThread {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        //创建一个线程池
        int poolSize = 3;
        Long beginTime = System.currentTimeMillis();
        ExecutorService pool = Executors.newFixedThreadPool(poolSize);
        List<Future> futures = new ArrayList<>();
        for (int i = 0; i < poolSize; i++) {
            MyCallable myThread = new MyCallable("my rallable test------" + i);
            // 执行任务并获取Future对象
            Future f = pool.submit(myThread);
//            pool.execute(myThread);//执行任务，无返回值
            futures.add(f);
            System.out.println(i);
        }
        // 关闭线程池
        pool.shutdown();
        for (Future f : futures) {
            System.out.println("res： " + f.get().toString());//get()阻塞至返回结果
        }
        System.out.println("cast:" + (System.currentTimeMillis() - beginTime) / 1000);
//        Callable myCallable = new MyCallable("my callable test");
//        FutureTask<String> task = new FutureTask<>(myCallable);//执行单线程带返回结果时 FutureTask
//        Long beginTime = System.currentTimeMillis();
//        Thread cthread = new Thread(task);
//        cthread.start();
//        String result = task.get();//get()阻塞至返回结果
//        Long endTime = System.currentTimeMillis();
//        System.out.println("hello," + result);
//        System.out.println("cast:" + (endTime - beginTime) / 1000);

    }
}

class MyCallable implements Callable<String> {
    private String str;

    public MyCallable(String str) {
        this.str = str;
    }

    @Override
    public String call() throws Exception {
        Thread.sleep(10000);
        return this.str + " append some chars and return it";
    }
}

class MyRunable implements Runnable {
    private String str;

    public MyRunable(String str) {
        this.str = str;
    }

    @SneakyThrows
    @Override
    public void run() {
        Thread.sleep(10000);
        System.out.println(this.str + " append some chars and return it");
    }
}

 

 

0
1
2
res： my rallable test------0 append some chars and return it
res： my rallable test------1 append some chars and return it
res： my rallable test------2 append some chars and return it
cast:10

Process finished with exit code 0